The Phlox is native to the eastern and central part of North America and the Phlox paniculata is commonly named garden phlox. The Phlox is a genus from the Polemoniaceae family. In Greek the word phlox means flame in reference to the intense flower colours of some varieties.
This Phlox paniculata ‘Casablanca’ grows strongly if it is placed in the right spot. That goes for the height and the width. It spreads through rhizomes. If you want to keep this garden phlox in one place it is best to place a rim around it.
I have placed the Phlox paniculata ‘Casablanca' in two different positions. In one position that is a bit moist the garden phlox thrives well and grows up to 4 ft 7 inches (1.4 metres). In the second position the soil is much drier and there the Phlox paniculata ‘Casablanca' only reaches 3 ft 3 inches (1 metre). In that dry spot the garden phlox also is more susceptible to powdery mildew.
The Phlox paniculata ‘Casablanca' does not like too much drought and for too long. That makes it more susceptible to powdery mildew. If you place the garden phlox in the right spot with enough moist it will hardly be bothered with mildew. The garden phlox prefers a sunny spot with rich, moist but well-drained soil and air that is not too humid.
In the summer the garden phlox blooms with large clusters of white, fragrant flowers that are very suitable as cut flowers.
Characteristic: newly emerging every year
Exposure: sun/ part shade
Foliage colour: green
Flower colour: white
Flowering time: July - August
Hardiness: -25 ºC/ -13 ºF
Height: 3 ft 11 inches/ 1.2 m